GAMA Master Series Manuale di servizio - Pagina 11

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Service Manual

Gun block unit and mix chamber

WARNING:

Before proceeding to carry out maintenance work on the gun, make sure

that the unit is at a complete standstill, that all the buttons and the general switch are

turned off and that the unit is disconnected from the main power supply. The gun is a

component that works under pressure; no connection must be opened and maintenance

work must not be performed on components subject to pressure until the pressure has

been totally eliminated.

Unscrew the diffuser. Remove the bolts fixing the product input blocks to the gun block and

carefully separate both blocks from the gun. Clean the contact surface using a cloth dampened

in gun-cleaning solvent.

PRECAUTION:

Use wooden or plastic utensils or a brass brush for cleaning. Do not

use metal utensils that can scratch the contact surfaces.

Remove the gun block mounting bolts and separate the gun block by sliding it over the

chamber. To eliminate the residual product, clean the gun block unit using a cloth dampened

with gun cleaning solvent and a brass brush. Remove the o-ring.

Use a spanner to lock the end of the pneumatic cylinder shaft and unthread the mixing

chamber. Clean the mix chamber and, if necessary, use a brush to go over the product passage

holes. Make sure that the chamber is not scratched or marked.

Replace the chamber if there are any small faults.

Screw the chamber back onto the end of the pneumatic cylinder shaft.

Fit the gun block unit by sliding it over the chamber and fix it to the gun with the bolts. Make

sure to fit the o-ring between the block and the fixing plate. Replace the o-ring if it is damaged.

Tighten alternately to avoid possible leaks.

Fit the side blocks to the gun block with the corresponding bolts. Tighten alternately to avoid

possible leaks. Screw on the Air Cap. The gun is now ready for service.

11/20

1.5 Issue

Ref. NR-00008-ENG

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